	(function(win, doc, mode) {
		/*orientationchange事件在设备的纵横方向改变时触发。*/
        var std = 750
        if (window.screen.availWidth < 1025 ? true : false) {
            var h = document.getElementsByTagName("head")[0]
            h.insertAdjacentHTML('beforeEnd', '<meta name="apple-mobile-web-app-capable" content="yes">')
            h.insertAdjacentHTML('beforeEnd', '<meta name="apple-mobile-web-app-status-bar-style" content="black">')
            h.insertAdjacentHTML('beforeEnd', '<meta name="format-detection" content="telephone=no">')
            h.insertAdjacentHTML('beforeEnd', '<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no,minimal-ui" />')
            if (mode == 'px') {
                if (!win.addEventListener) return
                var html=document.documentElement
                function setFont() {
                    function adaptVP(a){function c(){var c,d;return b.uWidth=a.uWidth?a.uWidth:750,b.dWidth=a.dWidth?a.dWidth:window.screen.width||window.screen.availWidth,b.ratio=window.devicePixelRatio?window.devicePixelRatio:1,b.userAgent=navigator.userAgent,b.bConsole=a.bConsole?a.bConsole:!1,a.mode?(b.mode=a.mode,void 0):(c=b.userAgent.match(/Android/i),c&&(b.mode="android-2.2",d=b.userAgent.match(/Android\s(\d+.\d+)/i),d&&(d=parseFloat(d[1])),2.2==d||2.3==d?b.mode="android-2.2":4.4>d?b.mode="android-dpi":d>=4.4&&(b.mode=b.dWidth>b.uWidth?"android-dpi":"android-scale")),void 0)}function d(){var e,f,g,h,c="",d=!1;switch(b.mode){case"apple":f=(window.screen.availWidth*b.ratio/b.uWidth)/b.ratio;c="width="+b.uWidth+",initial-scale="+f+",minimum-scale="+f+",maximum-scale="+f+",user-scalable=no";break;case"android-2.2":a.dWidth||(b.dWidth=2==b.ratio?720:1.5==b.ratio?480:1==b.ratio?375:.75==b.ratio?240:480),e=window.screen.width||window.screen.availWidth,375==e?b.dWidth=b.ratio*e:750>e&&(b.dWidth=e),b.mode="android-dpi",d=!0;case"android-dpi":f=160*b.uWidth/b.dWidth*b.ratio,c="target-densitydpi="+f+", width="+b.uWidth+", user-scalable=no",d&&(b.mode="android-2.2");break;case"android-scale":c="width="+b.uWidth+", user-scalable=no"}g=document.querySelector("meta[name='viewport']")||document.createElement("meta"),g.name="viewport",g.content=c,h=document.getElementsByTagName("head"),h.length>0&&h[0].appendChild(g)}function e(){var a="";for(key in b)a+=key+": "+b[key]+"; ";alert(a)}if(a){var b={uWidth:0,dWidth:0,ratio:1,mode:"apple",userAgent:null,bConsole:!1};c(),d(),b.bConsole&&e()}};adaptVP({uWidth:750})
                }
                win.addEventListener('resize', setFont, false)
                win.addEventListener('orientationchange', setFont, false)
                setFont()
            } else if (mode == 'rem') {
                var docEl = doc.documentElement,
                resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
                recalc = function() {
                    var clientWidth = docEl.clientWidth
                    if(!clientWidth) return
                    docEl.style.fontSize = 100 * (clientWidth / std) + 'px'
                };
                if(!doc.addEventListener) return
                recalc()
                win.addEventListener(resizeEvt, recalc, false)
                doc.addEventListener('DOMContentLoaded', recalc, false)
            }
        }
    })(window, document, 'rem')